Mechanical arm



FIG. 1 is a rear, right perspective view of a mechanical arm showing ournew design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left view thereof;

FIG. 5 is a right view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof; and

FIG. 8 is a partially enlarged view of FIG. 1 .

FIG. 9 is another partially enlarged view of FIG. 1 ; and,

FIG. 10 is a partially enlarged view of FIG. 2 .

The broken lines shown on the drawings depict portions of the mechanicalarm that form no part of the claimed design.

CLAIM The ornamental design for a mechanical arm, as shown anddescribed.